<template>
	<view class="preview">
		<!-- 预览图 -->
		<swiper circular :current="curIndex" @change="swiperChange">
			<swiper-item v-for="(item,index) in wallList" :id=item._id>
				<image @click="maskChange" v-if="readImgs.includes(index)" :src="item.picurl" mode="aspectFill">
				</image>
			</swiper-item>
		</swiper>

		<!-- mask栏 信息 评分 下载 -->
		<view class="mask" v-if="maskState">
			<view class="goBack" @click="goBack" :style="{top:getStatusBarHeight()+'px'}">
				<uni-icons type="back" color="#fff" size="20"></uni-icons>
			</view>
			<view class="count">{{curIndex+1}} / {{wallList.length}}</view>
			<view class="time">
				<uni-dateformat :date="new Date()" format="hh:mm"></uni-dateformat>
			</view>
			<view class="date">
				<uni-dateformat :date="new Date()" format="MM月dd日"></uni-dateformat>
			</view>
			<view class="footer">
				<view class="box" @click="clickInfo">
					<uni-icons type="info" size="28"></uni-icons>
					<view class="text">信息</view>
				</view>

				<view class="box" @click="clickScore">
					<uni-icons type="star" size="28"></uni-icons>
					<view class="text">{{curWall.score}}分</view>
				</view>

				<view class="box" @click="clickDownload">
					<uni-icons type="download" size="23"></uni-icons>
					<view class="text">下载</view>
				</view>
			</view>
		</view>

		<!-- 信息弹窗 -->
		<uni-popup ref="infoPopup" type="bottom">
			<view class="infoPopup">
				<view class="popHeader">
					<view></view>
					<view class="title">壁纸信息</view>
					<view class="close" @click="clickInfoClose">
						<uni-icons type="closeempty" size="18" color="#999"></uni-icons>
					</view>
				</view>
				<scroll-view scroll-y>
					<view class="content">
						<view class="row">
							<view class="label">壁纸ID：</view>
							<text selectable class="value">{{curWall._id}}</text>
						</view>

						<view class="row">
							<view class="label">发布者：</view>
							<text class="value">{{curWall.nickname}}</text>
						</view>

						<view class="row">
							<text class="label">评分：</text>
							<view class='value roteBox'>
								<uni-rate readonly touchable :value="curWall.score" size="16" />
								<text class="score">{{curWall.score}}</text>
							</view>
						</view>

						<view class="row">
							<text class="label">摘要：</text>
							<view class='value'>
								{{curWall.description}}
							</view>
						</view>

						<view class="row">
							<text class="label">标签：</text>
							<view class='value tabs'>
								<view class="tab" v-for="item in curWall.tabs">{{item}}</view>
							</view>
						</view>

						<view class="copyright">
							声明：本图片来用户投稿，非商业使用，用于免费学习交流，如侵犯了您的权益，您可以拷贝壁纸ID举报至平台，邮箱513894357@qq.com，管理将删除侵权壁纸，维护您的权益。
						</view>
					</view>
				</scroll-view>
			</view>
		</uni-popup>

		<!-- 评分面板 -->
		<uni-popup ref="scorePopup" :is-mask-click="false">
			<view class="scorePopup">
				<view class="popHeader">
					<view></view>
					<view class="title">壁纸评分</view>
					<view class="close" @click="clickScoreClose">
						<uni-icons type="closeempty" size="18" color="#999"></uni-icons>
					</view>
				</view>

				<view class="content">
					<uni-rate v-model="userScore" allowHalf />
					<text class="text">{{userScore}}分</text>
				</view>

				<view class="footer">
					<button @click="submitScore" :disabled="!userScore" type="default" size="mini" plain>确认评分</button>
				</view>
			</view>
		</uni-popup>

	</view>
</template>

<script setup>
	import {
		ref
	} from 'vue';
	import {
		onLoad
	} from '@dcloudio/uni-app'
	import {
		getStatusBarHeight
	} from "@/utils/system.js"
	import {
		getDetailWallApi,
		forWallScoreApi,
		writeDownloadApi
	} from '../../api/apis';
	// 当前分类的所有壁纸
	const wallList = ref([])
	// 我点击的壁纸信息
	const curWall = ref()
	// 我点击的壁纸在所有壁纸所属的下标
	const curIndex = ref(0)

	// 蒙层状态
	const maskState = ref(true);
	// 图片信息窗口开关
	const infoPopup = ref(null);
	// 评分窗口开关
	const scorePopup = ref(null);
	// 用户给予的评分
	const userScore = ref(0)


	onLoad((e) => {
		// 1. 确定数据来源
		const TYPE_STORAGE_MAP = {
			index: 'storeIndexWallList',
			search: 'storeSearchList',
			class: 'storeWallList',
			default: 'storeWallList' // 兜底值
		};
		const storageKey = TYPE_STORAGE_MAP[e.type] || TYPE_STORAGE_MAP['default']

		// 2. 获取并格式化壁纸数据
		const rawData = uni.getStorageSync(storageKey) || [];
		wallList.value = rawData.map(item => {
			return {
				...item,
				// 转换图片格式：将小图路径转为原图路径
				picurl: item.smallPicurl.replace('_small.webp', '.jpg')
			}
		});

		// 3. 定位当前查看的壁纸的下标的壁纸信息
		curIndex.value = wallList.value.findIndex(item => item._id == e.id)
		curWall.value = wallList.value[curIndex.value]

		// 4. 执行节流加载（后续图片预加载）
		throttleLoadImages();
	})

	// 切换swiper
	function swiperChange(e) {
		curIndex.value = e.detail.current;
		curWall.value = wallList.value[curIndex.value]
		throttleLoadImages();
	}

	//点击info弹窗
	function clickInfo() {
		infoPopup.value.open();
	}

	//点击关闭信息弹窗
	function clickInfoClose() {
		infoPopup.value.close();
	}

	//评分弹窗
	function clickScore() {
		scorePopup.value.open();
	}
	//关闭评分框
	function clickScoreClose() {
		userScore.value = 0
		scorePopup.value.close();
	}

	//确认评分
	async function submitScore() {
		const res = await forWallScoreApi({
			classid: curWall.value.classid,
			wallId: curWall.value._id,
			userScore: userScore.value
		})

		if (res.errCode === 0) {
			uni.showToast({
				title: "评分成功",
				icon: "none"
			})
			wallList.value[curIndex.value].userScore = userScore.value;
			uni.setStorageSync("storeWallList", wallList.value);

		} else {
			uni.showToast({
				title: "未知错误",
				icon: "none"
			})
		}
		clickScoreClose();
	}

	//下载壁纸
	async function clickDownload() {
		try {
			const {
				errCode,
				errMsg
			} = await writeDownloadApi({
				classid: curWall.value.classid,
				wallId: curWall.value._id
			});

			if (errCode !== 0) throw new Error(errMsg || (errCode === 400 ? '请求失败' : '未知错误'));

			/*如果是H5端*/
			// #ifdef H5
			const blob = await (await fetch(curWall.value.picurl)).blob();
			const link = Object.assign(document.createElement('a'), {
				href: URL.createObjectURL(blob),
				download: curWall.value._id
			});
			link.click();
			URL.revokeObjectURL(link.href);
			// #endif

			/*如果是小程序端*/
			// #ifndef H5
			try {
				const {
					path
				} = await uni.getImageInfo({
					src: curWall.value.picurl
				});
				await uni.saveImageToPhotosAlbum({
					filePath: path
				});
			} catch (error) {
				console.error('小程序保存失败:', error);
				if (error.errMsg?.includes('auth')) {
					const {
						confirm
					} = await uni.showModal({
						title: "权限申请",
						content: "需要相册写入权限以保存图片"
					});
					if (confirm) await uni.openSetting();
				}
			}
			// #endif

			uni.showToast({
				title: '下载成功'
			});
		} catch (err) {
			uni.showToast({
				title: err.message || '下载失败',
				icon: 'none'
			});
		}
	}

	//遮罩层状态
	const maskChange = () => {
		maskState.value = !maskState.value
	}


	//返回上一页
	const goBack = () => {
		uni.navigateBack()
	}

	// 节约浏览的阅览图片方式
	const readImgs = ref([]);

	function throttleLoadImages() {
		const {
			length
		} = wallList.value;
		const current = curIndex.value;

		// 计算相邻索引（自动处理首尾循环）
		const prev = (current - 1 + length) % length;
		const next = (current + 1) % length;

		// 合并并去重索引
		readImgs.value = [...new Set([
			...readImgs.value,
			prev,
			current,
			next
		])];
	}
</script>

<style lang="scss" scoped>
	.preview {
		width: 100%;
		height: 100vh;
		position: relative;

		swiper {
			width: 100%;
			height: 100%;

			image {
				width: 100%;
				height: 100%;
			}
		}

		.mask {
			&>view {
				position: absolute;
				left: 0;
				margin: auto;
				color: #fff;
				right: 0;
				width: fit-content;
			}

			.goBack {
				width: 38px;
				height: 38px;
				background: rgba(0, 0, 0, 0.5);
				left: 30rpx;
				margin-left: 0;
				border-radius: 100px;
				top: 0;
				backdrop-filter: blur(10rpx);
				border: 1rpx solid rgba(255, 255, 255, 0.3);
				display: flex;
				align-items: center;
				justify-content: center;
			}

			.count {
				top: 10vh;
				background: rgba(0, 0, 0, 0.3);
				font-size: 28rpx;
				border-radius: 40rpx;
				padding: 8rpx 28rpx;
				backdrop-filter: blur(10rpx);
			}

			.time {
				font-size: 140rpx;
				top: calc(10vh + 80rpx);
				font-weight: 100;
				line-height: 1em;
				text-shadow: 0 4rpx rgba(0, 0, 0, 0.3);
			}

			.date {
				font-size: 34rpx;
				top: calc(10vh + 230rpx);
				text-shadow: 0 2rpx rgba(0, 0, 0, 0.3);
			}

			.footer {
				background: rgba(255, 255, 255, 0.8);
				bottom: 10vh;
				width: 65vw;
				height: 120rpx;
				border-radius: 120rpx;
				color: #000;
				display: flex;
				justify-content: space-around;
				align-items: center;
				box-shadow: 0 2rpx 0 rgba(0, 0, 0, 0.1);
				backdrop-filter: blur(20rpx);

				.box {
					display: flex;
					flex-direction: column;
					align-items: center;
					justify-content: center;
					padding: 2rpx 12rpx;

					.text {
						font-size: 26rpx;
						color: $text-font-color-2;
					}
				}
			}
		}

		.popHeader {
			display: flex;
			justify-content: space-between;
			align-items: center;

			.title {
				color: $text-font-color-2;
				font-size: 26rpx;
			}

			.close {
				padding: 6rpx;
			}
		}


		.infoPopup {
			background: #fff;
			padding: 30rpx;
			border-radius: 30rpx 30rpx 0 0;
			overflow: hidden;

			scroll-view {
				max-height: 60vh;

				.content {
					.row {
						display: flex;
						padding: 16rpx 0;
						font-size: 32rpx;
						line-height: 1.7em;

						.label {
							color: $text-font-color-3;
							width: 140rpx;
							text-align: right;
							font-size: 30rpx;
						}

						.value {
							flex: 1;
							width: 0;
						}

						.roteBox {
							display: flex;
							align-items: center;

							.score {
								font-size: 26rpx;
								color: $text-font-color-2;
								padding-left: 10rpx;
							}
						}

						.tabs {
							display: flex;
							flex-wrap: wrap;

							.tab {
								border: 1px solid $brand-theme-color;
								color: $brand-theme-color;
								font-size: 22rpx;
								padding: 10rpx 30rpx;
								border-radius: 40rpx;
								line-height: 1em;
								margin: 0 10rpx 10rpx 0;
							}
						}

						.class {
							color: $brand-theme-color;
						}


					}

					.copyright {
						font-size: 28rpx;
						padding: 20rpx;
						background: #F6F6F6;
						color: #666;
						border-radius: 10rpx;
						margin: 20rpx 0;
						line-height: 1.6em;
					}

				}
			}
		}

		.scorePopup {
			background: #fff;
			padding: 30rpx;
			width: 70vw;
			border-radius: 30rpx;

			.content {
				padding: 30rpx 0;
				display: flex;
				justify-content: center;
				align-items: center;

				.text {
					color: #FFCA3E;
					padding-left: 10rpx;
					width: 80rpx;
					line-height: 1em;
					text-align: right;
				}
			}

			.footer {
				padding: 10rpx 0;
				display: flex;
				align-items: center;
				justify-content: center;
			}
		}

	}
</style>